[v5] Support timer drivers as loadable modules

[PATCH v5 0/4] Support timer drivers as loadable modules

Posted by walter.chang@mediatek.com 1 year, 4 months ago

From: Walter Chang <walter.chang@mediatek.com>

This set of patches aims to make SoC related timer drivers, such as 
timer-mediatek.c become loadable modules for the Generic Kernel Image
(GKI).

This driver registers an always-on timer as tick_broadcast_device on 
MediaTek SoCs. If the system does not load this module at startup, 
system will also boot normally by using built-in `bc_hrtimer` instead.
Besides, the previous experiment [1] indicates that the SYST/GPT, in 
combination with a loadable module, is fully operational.

The first three patches export functions and remove __init markings to 
support loadable timer modules.

The fourth patch makes timer-mediatek.c become loadable module for GKI.

[1]
https://lore.kernel.org/all/32777456f8e0f98e4cd5b950f421d21f71b149cf.camel@mediatek.com/#t

[v5]
- Add Signed-off-by tags in all patches
- Add Acked-by tags and Reviewed-by tags

[v4]
- Fix review comments pointed by Angelo

[v3]
- Rebase on linux-next

[v2]
- Convert timer-mediatek.c driver to loadable module

Chun-Hung Wu (4):
  time/sched_clock: Export sched_clock_register()
  clocksource/drivers/mmio: Export clocksource_mmio_init()
  clocksource/drivers/timer-of: Remove __init markings
  clocksource/drivers/timer-mediatek: Make timer-mediatek become
    loadable module

 drivers/clocksource/Kconfig          |  2 +-
 drivers/clocksource/mmio.c           |  8 ++++---
 drivers/clocksource/timer-mediatek.c | 33 ++++++++++++++++++++++++++++
 drivers/clocksource/timer-of.c       | 23 +++++++++----------
 drivers/clocksource/timer-of.h       |  6 ++---
 kernel/time/sched_clock.c            |  4 ++--
 6 files changed, 56 insertions(+), 20 deletions(-)

-- 
2.18.0

Re: [PATCH v5 0/4] Support timer drivers as loadable modules

Posted by Daniel Lezcano 1 year, 3 months ago

As I already said, I'm not very comfortable with these changes and the 
potential impact it can have on the overall time framework.

I will pick the series if Thomas gives its Acked-by

Thanks


On 17/05/2023 04:25, walter.chang@mediatek.com wrote:
> From: Walter Chang <walter.chang@mediatek.com>
> 
> This set of patches aims to make SoC related timer drivers, such as
> timer-mediatek.c become loadable modules for the Generic Kernel Image
> (GKI).
> 
> This driver registers an always-on timer as tick_broadcast_device on
> MediaTek SoCs. If the system does not load this module at startup,
> system will also boot normally by using built-in `bc_hrtimer` instead.
> Besides, the previous experiment [1] indicates that the SYST/GPT, in
> combination with a loadable module, is fully operational.
> 
> The first three patches export functions and remove __init markings to
> support loadable timer modules.
> 
> The fourth patch makes timer-mediatek.c become loadable module for GKI.
> 
> [1]
> https://lore.kernel.org/all/32777456f8e0f98e4cd5b950f421d21f71b149cf.camel@mediatek.com/#t
> 
> [v5]
> - Add Signed-off-by tags in all patches
> - Add Acked-by tags and Reviewed-by tags
> 
> [v4]
> - Fix review comments pointed by Angelo
> 
> [v3]
> - Rebase on linux-next
> 
> [v2]
> - Convert timer-mediatek.c driver to loadable module
> 
> Chun-Hung Wu (4):
>    time/sched_clock: Export sched_clock_register()
>    clocksource/drivers/mmio: Export clocksource_mmio_init()
>    clocksource/drivers/timer-of: Remove __init markings
>    clocksource/drivers/timer-mediatek: Make timer-mediatek become
>      loadable module
> 
>   drivers/clocksource/Kconfig          |  2 +-
>   drivers/clocksource/mmio.c           |  8 ++++---
>   drivers/clocksource/timer-mediatek.c | 33 ++++++++++++++++++++++++++++
>   drivers/clocksource/timer-of.c       | 23 +++++++++----------
>   drivers/clocksource/timer-of.h       |  6 ++---
>   kernel/time/sched_clock.c            |  4 ++--
>   6 files changed, 56 insertions(+), 20 deletions(-)
> 

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Re: [PATCH v5 0/4] Support timer drivers as loadable modules

Posted by Walter Chang (張維哲) 8 months ago

On Mon, 2023-06-19 at 18:44 +0200, Daniel Lezcano wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  
> As I already said, I'm not very comfortable with these changes and
> the 
> potential impact it can have on the overall time framework.
> 
> I will pick the series if Thomas gives its Acked-by
> 
> Thanks
> 

Hi Thomas,

Gentle ping for this series.

We would like to know your opinion on the time framework changes we've
discussed.

Thanks,
Walter Chang

Re: [PATCH v5 0/4] Support timer drivers as loadable modules

Posted by Walter Chang (張維哲) 1 year, 2 months ago

On Mon, 2023-06-19 at 18:44 +0200, Daniel Lezcano wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  
> As I already said, I'm not very comfortable with these changes and
> the 
> potential impact it can have on the overall time framework.
> 
> I will pick the series if Thomas gives its Acked-by
> 
> Thanks
> 
> 

Thanks for letting me know. I will wait for Thomas's response.

Thanks,
Walter Chang

Re: [PATCH v5 0/4] Support timer drivers as loadable modules

Posted by Walter Chang (張維哲) 1 year, 3 months ago

On Wed, 2023-05-17 at 10:25 +0800, walter.chang@mediatek.com wrote:
> From: Walter Chang <walter.chang@mediatek.com>
> 
> This set of patches aims to make SoC related timer drivers, such as 
> timer-mediatek.c become loadable modules for the Generic Kernel Image
> (GKI).
> 
> This driver registers an always-on timer as tick_broadcast_device on 
> MediaTek SoCs. If the system does not load this module at startup, 
> system will also boot normally by using built-in `bc_hrtimer`
> instead.
> Besides, the previous experiment [1] indicates that the SYST/GPT, in 
> combination with a loadable module, is fully operational.
> 
> The first three patches export functions and remove __init markings
> to 
> support loadable timer modules.
> 
> The fourth patch makes timer-mediatek.c become loadable module for
> GKI.
> 
> [1]
> 
https://lore.kernel.org/all/32777456f8e0f98e4cd5b950f421d21f71b149cf.camel@mediatek.com/#t
> 
> [v5]
> - Add Signed-off-by tags in all patches
> - Add Acked-by tags and Reviewed-by tags
> 
> [v4]
> - Fix review comments pointed by Angelo
> 
> [v3]
> - Rebase on linux-next
> 
> [v2]
> - Convert timer-mediatek.c driver to loadable module
> 
> Chun-Hung Wu (4):
>   time/sched_clock: Export sched_clock_register()
>   clocksource/drivers/mmio: Export clocksource_mmio_init()
>   clocksource/drivers/timer-of: Remove __init markings
>   clocksource/drivers/timer-mediatek: Make timer-mediatek become
>     loadable module
> 
>  drivers/clocksource/Kconfig          |  2 +-
>  drivers/clocksource/mmio.c           |  8 ++++---
>  drivers/clocksource/timer-mediatek.c | 33
> ++++++++++++++++++++++++++++
>  drivers/clocksource/timer-of.c       | 23 +++++++++----------
>  drivers/clocksource/timer-of.h       |  6 ++---
>  kernel/time/sched_clock.c            |  4 ++--
>  6 files changed, 56 insertions(+), 20 deletions(-)
> 

Gentle ping for this series.

Thanks,
Walter Chang